EP240801a/XRF 240801B：爱因斯坦探针探测到的X射线闪及其多波段余辉的启示
高能天体物理现象
2025-03-07 v1
摘要
本文展示了EP240801a的多波段观测与分析结果。EP240801a是2024年8月1日由爱因斯坦探针（EP）卫星发现的低能量、极软伽马射线暴（GRB），Fermi/GBM也探测到了其微弱的共现信号。通过GTC和Keck获得的余辉光学光谱确定了红移。EP240801a在X射线中的持续时间为148秒，在伽马射线中为22.3秒，X射线领先80.61秒。谱时延分析表明伽马射线信号比X射线早到达8.3秒。对EP/WXT和Fermi/GBM数据的联合谱拟合得到各向同性能量，峰值能量，流量比，将EP240801a归类为X射线闪（XRF）。利用Prospector推断的宿主星系连续谱用于校正其对观测爆发光学数据的贡献。异常的早期R波段行为和EP/FXT观测表明余辉存在多个成分。考虑了三种模型：双成分喷流模型、正向-反向激波模型和能量注入的正向激波模型。三种模型均提供了合理解释。在双成分喷流模型和能量注入模型中，喷流在视线方向的初始能量和速度相对较小，而正向-反向激波模型则保持典型特征。在双成分喷流模型下，若将明亮的窄束视为轴上观测，EP240801a可能类似于GRB 221009A（BOAT）。因此，EP240801a可解释为离轴（窄）喷流或本征较弱的伽马射线暴喷流。本研究结果为揭示X射线闪的起源提供了重要线索。
引用
@article{arxiv.2503.04306,
title = {EP240801a/XRF 240801B: An X-ray Flash Detected by the Einstein Probe and Implications of its Multiband Afterglow},
author = {Shuai-Qing Jiang and Dong Xu and Agnes P. C. van Hoof and Wei-Hua Lei and Yuan Liu and Hao Zhou and Yong Chen and Shao-Yu Fu and Jun Yang and Xing Liu and Zi-Pei Zhu and Alexei V. Filippenko and Peter G. Jonker and A. S. Pozanenko and He Gao and Xue-Feng Wu and Bing Zhang and Gavin P Lamb and Massimiliano De Pasquale and Shiho Kobayashi and Franz Erik Bauer and Hui Sun and Giovanna Pugliese and Jie An and Valerio D'Elia and Johan P. U. Fynbo and WeiKang Zheng and Alberto J. C. Tirado and Yi-Han Iris Yin and Yuan-Chuan Zou and Adam T. Deller and N. S. Pankov and A. A. Volnova and A. S. Moskvitin and O. I. Spiridonova and D. V. Oparin and V. Rumyantsev and O. A. Burkhonov and Sh. A. Egamberdiyev and V. Kim and M. Krugov and A. M. Tatarnikov and R. Inasaridze and Andrew J. Levan and Daniele Bjørn Malesani and Maria E. Ravasio and Jonathan Quirola-Vásquez and Joyce N. D. van Dalen and Javi Sánchez-Sierras and Daniel Mata Sánchez and Stuart P. Littlefair and Jennifer A. Chacón and Manuel A. P. Torres and Ashley A. Chrimes and Nikhil Sarin and Antonio Martin-Carrillo and Vik Dhillon and Yi Yang and Thomas G. Brink and Rebecca L. Davies and Sheng Yang and Amar Aryan and Ting-Wan Chen and Albert K. H. Kong and Wen-Xiong Li and Rui-Zhi Li and Jirong Mao and Ignacio Pérez-García and Emilio J. Fernández-García and Moira Andrews and Joseph Farah and Zhou Fan and Estefania Padilla Gonzalez and D. Andrew Howell and Dieter Hartmann and Jing-Wei Hu and Páll Jakobsson and Cheng-Kui Li and Zhi-Xing Ling and Curtis McCully and Megan Newsome and Benjamin Schneider and Kaew Samaporn Tinyanont and Ning-Chen Sun and Giacomo Terreran and Qing-Wen Tang and Wen-Xin Wang and Jing-Jing Xu and Wei-Min Yuan and Bin-Bin Zhang and Hai-Sheng Zhao and Juan Zhang},
journal= {arXiv preprint arXiv:2503.04306},
year = {2025}
}
备注
22 pages, 11 figures, submitted to ApJ